Bullet not stabilizing

Any of you smokeless muzzleloader shooters have any advice on why I can't get my bullets to stabilize their tumbleing hitting target sideways at 100 yards. At 25 yards getting it on paper they punch a clean hole so they are flying right at that distance. It's a Encore 18" SSK Industries 45-70 barrel 1/14 twist converted by Jeff Hankins. I know the twist is a little bit fast for light bullets, I thought going to a heavier bullet would fix the problem but that's not the case. I'm shooting...

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